@platform/react/lib/events/event.window.focus.js

React refs and helpers.

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.focus$ = void 0;
var rxjs_1 = require("rxjs");
var operators_1 = require("rxjs/operators");
var util_is_1 = require("@platform/util.is");
var _focus$ = new rxjs_1.Subject();
exports.focus$ = _focus$.pipe((0, operators_1.share)());
(function () {
    if (!util_is_1.is.browser) {
        return;
    }
    var last = document.activeElement;
    var hasChanged = function () {
        var current = document.activeElement;
        var result = last !== current;
        last = current;
        return result;
    };
    var onEvent = function (type) {
        return function () {
            var e = {
                type: type,
                from: last || undefined,
                to: document.activeElement || undefined,
            };
            if (hasChanged()) {
                _focus$.next(e);
            }
        };
    };
    window.addEventListener('focus', onEvent('FOCUS'), true);
    window.addEventListener('blur', onEvent('BLUR'), true);
})();